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AOS (Optical Levers)
masayuki.nakano - 16:00 Sunday 21 April 2019 (8706) Print this report
strange behavior of PR3 optical lever

The optical lever of the PR3 showed strange behavior at 4/21 6:19:31 UTC.
The SUM fluctuation got larger suddenly, and the oplev control cannot engaged.

I attached the plot and spectra of the oplev signals. Blue curves are the current one and red curves are the ones of yesterday.

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masayuki.nakano - 16:22 Sunday 21 April 2019 (8707) Print this report

Mmm, the signal came back. I guess the laser source for the oplev gets close to out of order.

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masayuki.nakano - 12:47 Monday 22 April 2019 (8712) Print this report

[GGG, Nakano]

We changed the laser module for the oplev of the PR3. Now the SUM signal is about 10000.

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